SOL is an extension attached to a 2-D representation of the bottom copper layer from a printed circuit board (PCB). SOL is part of the Gerber family of extensions, which represents the de facto standard in the PCB industry. Other similar formats include CMP, STS, STC — to name just a few. Gerber files contain descriptions of various board details, such as electrical connections, copper layers, solder masks, silkscreen data etc.
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